Interesting and thank-you. It was built by Katakura in 1985. However, this is the first Katakura serial number I've seen with the 3rd character above 'L'. Until now, I've thought it was a month indicator, but if it really is a 'P' then would suggest a fortnight indicator. Still, it could also be a partially stamped 'B" or a poorly stamped 'F'. I'd really appreciate it if you could take a closer look. TIA.