Some postmarks are easier to find than others, of course. Railway postmarks (apart from Sevastopol' Vokzal) are pretty thin on the ground - I'm still looking for a Kerch' railway postmark for instance - and Volostnoe Pravlenie postmarks are downright rare. Seasonal offices are another group that's rarely seen.
Kerch' actually managed to cram 4 offices into its area: Kerch', Kerch' Railway, Kerch' Krepost and Kerchenskii Zavod. The latter is another office you'll rarely see:
Then there are the Town Sub-offices. Unsurprisingly, Sevastopol' and Simferopol' both had Town sub-offices, although examples are not easy to find. The one that really surprised me was Feodosiya:
By the way, both postmarks have a "1" at foot which I think implied that these were considered to be the 1st sub-office of the main post office.
Town sub-offices are not listed in the invaluable Kiryushkin-Robinson list of Imperial Russian post offices, so each one that turns up is a surprise. I wonder how many more there are?
