I, normally, buy specialised Machins from Mike Holt (died a decade ago), John M. Deering, or B. Alan (closed down last June).
The big lot I posted last month was from B. Alan. They published the Connoisseur Catalogue (CC) and have a good reputation.
DFor some stamps, I have to figure out which stamp it is, but I am missing all the varieties for that CC number. I assume the most common for the CC number. There was little risk involved.
The last two lots are from private
ebay sellers. One appears to be somewhat more professional. There is a bit of a gamble involved. The first lot were mainly coil and prestige booklet stamps. The pictures on
ebay gave me some confidence they were the correct stamps, when seeing the cut perforations. The margins help recognising the booklet stamps.
The last lot even had detailed descriptions of the cylinders (colour and phosphor). The positive approach is to consider the seller had these by the sheet or has broken up cylinder blocks. Also, some stamps have labels or margins attached that help in narrowing down the possibilities.
You made a valid point. Most these stamps are very basic. There were a few that were more than £ 1, or £ 1.25. The 4½p one should be a PUI (phosphor under ink). It is somewhat recognisable from a picture. At less than £ 5, it was by far the most expensive stamp. There are a few PCP1/PCP2 that are over £1. From what I have checked, they are as described.
With very few specialist dealers remaining, it beats buying many lots hoping the one I want is there. So, yes a bit of a gamble, but probably the most efficient one. And I have not had a reason to mistrust these sellers. I must have a closer look at some to be sure.
Tha