This was included in the parts that came with my 47 Indian basket, but doesn't look like it is the correct relay.
It appears to be brand new and manufactured in the early 60's. Can't find any info by searching using the part number on the packaging or on the relay.
Appears to be the common type replacement cut-out relay for 47 and earlier autolite generators.
There may be some small differences ,like curved feat on the original,but will most likely work.
No idea about part numbers.