Thailand revenue stamps

Hi Jos,
we are privileged to have you aboard.
Only problem with Thai Revenues,...finding stock in Australia.

Just some "bits and pieces"

One of my Catalogues


Becoming familiar with Thai scripts.


Officially sealed Labels  (I paid $2.95 +ship 2012)
 

Hello Rod,

Also nice to see you on this board your knowledge on all things stamp related does amaze me.
By the way, the lady playing the 3 string instrument, I think it’s a lute, on the stamps you show, is called in Thai PhraUthean.
An error in design shows on some stamps a 4th tuning peg while the instrument has only 3 strings.

thailandrevenues

Cancel the above Jos !     Found it

The "Phin"  (Type of Lute)

I am putting on Facebook a weekly post. Since not all members in TSF have Facebook, I will add similar posts here.

Consular or Diplomatic Service fee revenues used by foreign embassies or consulates based in Thailand.
this is an interesting niche area to collect in addition to the revenues of Thailand.
these stamps are used mainly on visa for passports or for legalizing documents at the embassies.
Single stamps are difficult to find because the name of the country or Thai city has to be placed exactly on the stamps. More luck can be had with stamps on piece or even on document. In spite of the difficulty to find those stamps, most of them can be had for a few dollar. I am always looking for more to expand my collection. 

General question on perforations.
In all the years I collect, I have seen many references on perforations. However, I have never seen a reference to the size of the holes due to different size of the punches. 
In the 2 pictures below both stamps have perforation 13.5. However, the green stamp has clearly smaller holes than the red color stamp.  Why does nobode seem to talk about this. If happens in the same catalog number stamp, it is clearly a variation?
Please advice

link


Measurements of Stamp Separation Features by Digital Image Analysis
Robert V. Mustacich, 722 Camino Cascada, Santa Barbara, CA, USA.

ABSTRACT. Digital image analysis of perforations provides useful characterizations of stamps and the mechanical processes used to create them. Using this approach, the hole sizes, the spacing between holes, and related parameters are easily measured to micron-level precision. The 150 year history of stamp perforation is revealed by analyzing entire sheets of stamps, showing stages of improvement in the quality of rotary perforation. It is also possible to compare various types of rotary and stroke perforation, as well as the likelihood of re-perforation. Further, these analysis methods can describe other stamp edge profiles such as rouletted and die-cut separation.

Introduction

The analysis of perforation images was used recently to solve a mystery regarding forged extra perforation of 19th century U.S. revenue stamps (Mustacich, 2014). The focus of that effort was finding a way to measure inconsistencies in hole spacing to fingerprint each row of perforations, and determining if there was a single manufacture of these extra perforations. The studies described in this article apply these methods more broadly to investigate perforations, and extend the image analysis to include other types of separation.

This stamp image analysis research covers four topics: (1) Using statistical analysis of perforation features to reveal the quality of perforation over the history of U.S. federal stamp production, comparing the characteristics of different methods of perforation; (2) investigating possible stamp re-perforation; (3) applying perforation fingerprinting to modern issues; and (4) modifying the methods for the analysis of other types of stamp separation.

There are several interesting aspects of these topics. Since rotary perforators were such a difficult machine to manufacture, was there improvement in these machines over the history of perforation that is evident from examination of the stamps? For example, was there improvement that coincides with the initiative between the Bureau of Engraving and Printing and the National Bureau of Standards in the early 1980s to address the problems of manufacture? And then later, how did the transfer of perforation to private contractors in the late 20th century affect the observable characteristics of perforation? How do the characteristics of differently produced perforations compare? Example applications address several of these topics. These include suspected re-perforations, the fingerprinting of modern stroke-perforated U.S. stamps, the analysis of rouletted separations of early stamps of Finland, and the measurements of modern die-cut U.S. stamps.

Rod,
Thanks for the support. I think this is quite an interesting subject. I plan to review the agriculture revenue stamps I have (about 1,200) and look if I can find other series with a similar feature. When done I will write a short summary on this forum.
Thanks again.

Puncture Diameter sizes in Stamp Perforations.
Another consideration.

quote
My investigations of effective hole size by machining punches using replacement perforator pins shows that holes tend to
slightly smaller sizes than the pin size, by about 1-4% depending on factors such as the stiffness of the paper and the
clearance of the pin in the hole. Small clearances and stiff paper result in hole sizes closer to the pin size.

Soft paper or large clearances appear to allow stretching of the paper before the pin bursts through the paper,
and the relaxation of the paper results in a smaller effective hole size (Mustacich, 2015).

Thailand Long Green Court Fee stamps used at the British Consulate in Bangkok, between 1896-1909.
For quite some years the 2 stamps shown below, were part of my collection and I had absolutely no idea why the British would use Thai stamps. Recently the internet gave me the solution.
In 1855 as part of the Bowring treaty between Britain and Siam, Siam was forced to accept that they could not longer prosecute in their courts British citizen. A British Consular court was established to prosecute British citizens living in Thailand, using British law and British judges. Many British subjects including Burmese and Shan lived in Thailand, working for British trading companies. Most of them involved in hard-wood harvesting and trading in the northern part of Thailand.
So the 2 stamps shown were clearly used by the British Consular Court. The Consular Court was dismantled in 1909 in a treaty in which Thailand lost Kelantan, Trengganu, Kedah and Perlis to British Malaya.
I think the cancellation on the 2 stamps is unique.

thailandrevenues

Thai Occupation of Trengganu
1944
Sailing Boat  $3  red brown and black
Corner Marginal
Estimate £20

The Erawan Court and Land Fee revenues 1915-1984
The Erawan ( mythical 3 headed elephant) stamps are the most complicated series of Thai revenues to sort out. 70 years of usage, 5 different printers, different perforations, different papers all add to the complications.
I have posted on my website my complete 68 page collection of those issues to help. You can find them here;
www.thailandrevenues.com/erawan-collection
If you have any questions, comments, let me know.
You can support my website and Facebook posts by registering your name and email on my website; www.thailandrevenues.com To register is for Free.