Thanks Joseph,I found this at a Restore type of new and used building materials shop (Bent Nail New and Used) it may be from the late 70's to mid 80's.Also found a Restore here in Abby,but nothing unusual there.
October '86. Lucky you had cleartops north of the border that late. I have a Sylvania 175w merc made in the USA back in '85, fully coated but with the old mogul base.
@Darren I've uploaded a picture of mine in my various lamps gallery. I got mine at a Home Hardware store though. There's a few Restores near me but I've only found old fluorescents and incandescents in them.