These are from the same seller as the ones I bought earlier in the month, and are also samples. Pleasantly, the person who had given them to the seller said they were manufactured by van Genechten, which is what I'd guessed they were. That's nice.
These cards aren't in the same pristine condition as the other ones, but they're still pretty good given their likely age (which I guess is the same, 1870s).
Other than having different numbers (these are 2132 rather than 2196), the new cards are much the same. However, they have an extra colour to them: peach. It's mainly used on hands, faces and flooring, but also appears elsewhere (on the King of Spades' ermine, for example).
The 2132 cards have less ornate backs, but that didn't help me track them down. I did find a record of some peach-faced van Genechten cards from 1880, but these are turned (so all the upper pips are in the left corner) whereas my samples aren't.
This new set of samples is much smaller than the earlier one. I only have:
2 Jacks of Hearts
2 Jacks of Clubs
2 Kings of Clubs
10 Jacks o Spades
2 Queens of Spades
1 King of Spades
I don't know what it is with the surfeit of Jacks of Spades. Either the people for whom the samples are intended really like or really dislike Jacks of Spades; I don't know which.
It's OK, there aren't any more of these for sale, so you're spared further ramblings for the moment.