Not a locking mechanism?

No, nothing to do with locking. I'll be seeing the previous owners sometime in the next week or so, so I will have to ask them.

are they old double hung? to stop rattling?

My first thought was a place for cord wraparound for blinds or shades, but the shape isn't right for that...

Maybe a pic from a farther distance? It's really hard to get an orientation this close up.

Here is one in place but I'm not sure if the orientation is correct.

Are they to stop blinds from hitting too hard on the sill?

Hmmmm..No idea.

Not a clue...I'll be interested to hear what you find out.

Well, now I'm really curious since the people who have posted so far don't know. I think I will have to call the previous owners sooner than later. Will be sure to let you know what they are.

I guess your agent can't ask the previous owner ?

Are they magnetic? Keep blinds from rattling? Are you in earthquake country?

We are in touch with the previous owner, so I can ask them myself. I don't think they can keep the blinds from rattling. They are not magnetic and we aren't in earthquake country. They are loose and I've knocked more than a few out while cleaning the windows. So strange!

A weeping hole cover maybe?

So?? What are they??

Unfortunately I don't know yet. Our sellers haven't called me back yet. I think they said something about going out of town for a few days so it may be later this week before I can speak with them. But I promise to come back with the answer!

would they be used to prop a window open? (I don't know if some old windows were less likely to stay open if opened just a crack??)

At first look I wondered if they were a part of a security system but they would need to be plugged into something, wouldn't they?

I need to know NOW. It's driving me crazy. :D

The fact that they aren't attached to anything is what has me stumped. I was convinced they were cord holders at first, but those would need to be screwed in. It seems like something would fit in the opening, but what??

This is a great mystery!

This is driving me crazy. I just spent 10 minutes going down a google image rabbit hole, and am still stumped. My best guess at this point is that they are window stops to prevent the window from being opened beyond a certain point.

Ha! I don't post a lot but I think this is the most interest one of my posts has ever gotten in 15 years of being here! ;)

They are sort of flimsy and move really easily, so I don't think they stop blinds or keep windows from opening. So weird. I really want to know NOW, too!

My first thought was something to do with a security system. I just showed DH who usually knows everything. He said "it keeps evil spirits away." :-/

That works for me, Allison! I have to go run a few errands. Think I'll take some with me and stop at a hardware store and see what they know.

I wonder if they are for pushing the caulk back in place in the corners, or if they hold plexiglass in place in the winter?

Window bling. :)

a new, modern, glass point thingy?

I noticed there's no screen in the window...can they hold a screen in place?

Some kind of curtain rod holder?

Inquiring minds want to know. Hurry up with the answer.

It would be funny if these thingamajigs have nothing at all to do with windows, and the PO just accidentally left them behind. :D

Thanks for letting us know! Fun thread, plus learned something new. :)

Here is a better up close picture. And I think they work like the second pic. The pointy end digs into the wood frame, and the other end holds the grid on. I was thinking they would sit in each corner so they are less obtrusive, but I'm having a difficult time getting them in there. They are quite small and I seem to be all thumbs today.

I'm glad the great mystery of 2015 has finally been solved!

Hah! Who'd a thunk!

oh!! I didn't see the pointy part before... that does remind me a little of some picture frames!