SI marked outdoor door latch

A handy person from DC says:
The latch is means to hold the door in place when it's closed, but not locked.
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Dave Sr. from SWISCO responded:

I have seen hardware like this in the past by this SI company. I think they were an "after market" hardware supplier. I don't think that this part can still be found. 

What I did on my patio screen door at home was to use the 32-304 magnetic catch to keep my sliding screen door from opening up by itself. If your door is a swing type door, take a look at the 10-057 to see if this is something that could work on your door.

A professional from NJ says:
This pic actually helped me find a similar part, believe it or not.
And just in case it will help someone else in the future:
The SI marked on this part represents Siegenia, a European company that specializes in door technology, and this part in particular is called a Balcony/Patio Door Catch.

It's near impossible to find in the USA, but there are plenty of UK and Germany sellers with these catches still in stock
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