Thanks all for your comments.
Scotzm, that is interesting about Mosley. Once these fronts are properly displayed in my albums, I will have to mark that down.
What I am wondering now is, these are 'supposed to be fronts' only but this is the scan of the other side of the Mosley item you mentioned. Were they conserving paper back then and re-using the envelopes?? Also. with free postage, was re-using the same envelope a common practice??
Interesting alright
Here is a scan of the opposite side.

Chimo
Bujutsu