Do I have a i-61 or i-61LD?

the I 69? I've never seen it before...a 28mm/2.8. looks sort of cheap but inexpensive and compact.

I've never heard of the I-69. Are you sure it's a rangefinder lens? The only 28mm FSU lens I know of for rangefinders is the Orion-15. I will look in Princelle when I get home tonight.
 
According to Princelle, the I-69 was made for the Chaika half-frame camera. While it had a 39mm screwmount, it isn't rangefinder coupled, and probably has a different focal registration than LTM standard. He does note that it could be used as an enlarger lens.
 
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