Tony: good point about the pin. It does not have a way of retaining it (typically a spring-loaded ball etc). The width between the opening is 2-9/16". It is a 1/2" pin. The width between the 2 stubby tabs is 2-3/8". I carefully washed off all the preservative and found a casting mark "X-144". At this point I suspect it may be a manufacturing jig use to test fit parts.
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