St Petersbourg - Paris 1864-05-06 Dob020201a

Russia stampless folded paid letter to Fould & Cie in Paris France, 'St. PETERSBURG * VII. EXP. / 6 MAI 1864' cancel, various manuscripts, boxed 'Aus Russland Franco', French 'PRUSSE ERQUELINES' receiver Paris (21 May 1864).
Details:

May 6, 1864 (Julian) a letter inside datelined May 5/17 reflecting the Julian/Gregorian calendar posted at St. Petersburg, by E.M. Meyer & Co. Sender wrote 'payeé' (paid) in lower corner left. At the post office weight and rate was assessed and marked on the letter, manuscript at top corner left '2' for double rate category. The letter was paid but this was not restated by handstamp (no 'FRANCO' marking). 'St. PETERSBURG * VII. EXP. / 6 MAI 1864' backstamp was applied.
Dobin: 02.02 type 01a. Applied by the office for accepting and dispatch of foreign correspondence, postmark was used between 1859-1866, Rarity 1.[1]
May 19, 1864 (Gregorian) 'EYDKUHNEN 19 5 II BROMBERG' T.P.O. backstamp applied.
'Aus Russland Franco' marking on applied - type RY8, used on the Eydkuhnen-Bromberg T.P.O. This marking was used on the Konigsberg-Bromberg T.P.O. from 1859 and on the Eydkuhnen-Bromberg T.P.O. between 1862-1864.
Vandervelde:'Aus Russland Franco' type Ry8
May 21, blue 'PRUSSE ERQUELINES 21 MAY 64 3'. French entry mark at Erquelines. 3's show the postmark was struck at Paris. Letter was also marked by the French with red 'P.D.' (Payee au Destination).
Noël: #1021[2]
May 21, 'PARIS 21 MAI 64 (60)' receiver at back.