Yep, 9 months between this and the M-400. I've seen after looking under the Lamps album on GoL that there are quite a few lamps on here that were made in 1973 ^_^
1973 means early Yttrium Vanadate coating. IIRC it was introduced to MV lamps a few years before.
Is the light colour/quality (CRI) very different to modern DX coated lamps? Thanks.
Is the light colour/quality (CRI) very different to modern DX coated lamps? Thanks.