Gary - 11/26/2006 at 09:20
This lovely cover carried 110 rubles from Moscow to Germany in 1905. The front and back are shown as well as an enlarged image of the wax seal on the
reverse.
Moscow's 3rd Dispatch Office, serial 13, applied its mark on 30 July 1905. This particular postmark is known only for a brief period in 1905, between
march and July, and is only known with the serial 13. The 3rd and the 6th DOs handled money in the 1890s and mainly the 3rd DO into the early years of
1900-1905. After mid-1905, it appears that the 6th DO again was handling money correspondence.
The cover passed through the border at Kibarty on 1 August as noted by mark on back of cover.
SO? The interesting part here is that the wax seals on the back are from the 6th DO and not the 3rd DO.
We definitely could use more examples for this analysis. If you have any, please show them. Thanks.
===front of cover

Back of cover
Gary - 11/26/2006 at 09:20

Was seal enlarged
Gary - 11/26/2006 at 09:22

Alep - 11/26/2006 at 13:08
Are you sure that No. 6 is just the DO number? I doubt it. In my opinion, it is rather a serial of the sealing device.
Gary - 11/26/2006 at 13:51
You could be correct. My theory was to see if we can develop a relationship between the 3 DO and the 6 DO. Perhaps not? We definitely need more
examples to decide.
The 6th DO had serials/numbers 1, 10, 13, 15 from 1909 on.