Identification Of "On Piece" Stamps Discussion

Has anyone solved the problem of identifying stamps on piece or full covers that need watermark or other special verification methods. For example these two on piece I have not been able to identify with certainty. Don't imagine they are anything special, but I would like to know what they are. Can we discuss this?

Sometimes a sign-scope will work. Mostly I see Morley Bright watermark detectors used. In extreme instances for pricey stamps that are hard to identify they will actually remove and replace the stamp.

1775mac - sign scope? ok pleading ignorance here. please explain. And does Morley's help you with "on piece"?

Basically, a watermark detector with a back light. The T1 model is the cadillac of them.

T1

T2

It is possible to use the T1 with letters. Many use the Morley Bright. Basically it has a die pack that you set on top up the stamp and squeeze to make the impressions raise up and show on top of the pack.

Morley Bright

thanks 1775mac

This previous post might be helpful, where a similar discussion ensued:

https://goscf.com/t/11096

thanks wt1

This is a 1922 usage so probably perf 11. First check perf and print method. If it is perf 11 offset then verify type (IV-VII). If engraved verify flat plate or rotary and type. As for watermark with a 1922 postmark I would not wory about it being 461.
The 461 was printed from plates 7259, 7561, 7264 and 7265. A total of 1900 panes (190,000 stamps) were printed. They were all sent to the main post office in Washington. Most contemporary used would have a Washington postmark and a date of July 16, 1915 to Aug 1, 1915. Official records show delivery on July 16. No used copies are known after early 1917.

Thanks Russ, I will check those things, the 461 was the quandry - Jeff

Russ, could you point me to the reference where you got the info about 461?