"Tiny Cover" Attached To 1906 Gainesville FL Post Card

Today a friend gifted me this post card knowing that I collect 'tiny covers'. This 'cover attached to post card' is new to me (although I have seen the reverse 'postal card attached to cover'). I know that 'postal card attached to mail' was considered illegal, am I correctly assuming that what is pictured above considered illegal (i.e. against postal regulations)?

The tiny cover has an enclosure which verifies that it was originally attached to post card when sent. I'm not sure that this qualifies for my 'tiny cover' collection but I find it interesting.
Don

I don't believe these were "illegal", just requiring 2 cents letter postage, if noticed. I'll see if I can dig out a few that were charged due.

Add: Here's one that got caught and charged the letter rate:

Fascinating..that's a first for me.

You were not to glue (attach) things to a postal card or post card. If that was done and found the card was to be re-rated to first class matter. I too own some of these tiny attached envelope post cards.

Notes on post cards also came in other covers, in this case a hand cover:




The most common cards were the cards with a felt "flag" being glued on the post card. The flag carried a word, usually a town name. To avoid the additional charge the felt flags were replace by ink printed flags as part of the post card design. Below is one with both felt and just ink printed flags. Not caught for postage due.



Caught for postage due:

Could it simply be a form of leporello.

The kind were you pull a little string of pictures or messages out of the envelope.

This would make the tiny cover a part of the postcard and not an extra attached cover.

That's pretty cool