Hello, I have a delco light plant that was given to me in pieces. I think it is an 850, but I am not sure, The small aluminum serial number tag reads "Delco 180799". Is there any way to verify that it is an 850 from that number? Also how do you date them? The flywheel turns over but when the piston gets to the top it seems to bind up. Any thoughts? Attached is a photo of the control panel. Thanks in advance for any help.
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