Serial # NE0020536

N: Nottingham?
E: 1970?
0020536: 20,536 made that year at that plant

Sounds like you're going on the chart below, but that system was put into place after around 1974, so I'd say your RRA is 1980 (and as far as I know the RRA wasn't produced in 1970).

Neal

So, no I was going by the chart I saw at Sheldon Brown's (RIP) site. This chart makes even more sense as the hubs are a bit more modern than 1970, and the shop it was serviced at (and presumably purchased from) wasn't in business in 1970.

Nottingham, April, 1980, #20,536. Looks like that's my story, and I'm sticking to it.

Thanks, Neal.