These are a bit rare here but I think some older gas stations had these with mercs. I think the refractor is similar to what the circline cloud fixtures use.
Yeah, its not common here these are the only ones I know of here , they are still here considering I go by there a lot, they are rebuilding the shell station but luckily they did not take down the current fixtures. There are also Model 25's at the rec center just beside it. They were MV until 2010, now they are HPS, they switched the MV to HPS and installed LED shoebox's all around.
cool light! there re some jumbo drop lens 1000W MV shoeboxes here in some places too. I've never seen one with such a flat top housing though. seems like there's not much room for a ballast. I've never seen a 327 here in RI. I knew of one 17-000 (which came before the 327) but it was at Garden City and it was removed.