Those look like Santa Rosas. Sweet, juicy, early ripening plum with reddish purple skin and red meat. Yummy!!!
Crabapples and quinces are also good for making pectin.
Sounds like you had them in you hand! Yep, red fleshed. Tasty!
Now, the SAD part....I didn't spray, not having fruit several yrs. This bug thing laid eggs in tiny fruit, there are tiny white worms in there...some stage of development...at the pit.

Tossed them all.....




NEXT YR. I will spray!!!!!

. Can't fix it now.
This is my job today. Crank and till the garden.

This works for initial deep till, already did disc with tractor. But it isn't any good for working after planted. It is a 36" till width. At the time, several years ago, it cost half the DR brand pull, which had electronic lift feature that I wanted, not enough $ to get. So, this is a PIA without that or just have extra space to turn, still tilling. I had the space. And had no tractor then, so this was an option. Works well if you can deal with limits. NEXT time, PTO one for tractor that I now have.

Notice, deck off mower...gotta do or the deck hangs in the freshly disced dirt disc on repeat go overs. That's another bad but, soon this old mower will no longer be used to mow.....just pull stuff. It's a tough old bird made with real metal, big engine, low geared rear end..

. I have a smaller walk behind tiller, too...for row use.