We had our monthly OAC collector gun show yesterday and the guy next to me had a bunch of inexpensive old 3/4" scopes. All were internal adjustment, and nothing high magnification. He also had some neat 1" old scopes like an early Lyman Alaskan, and an early Leupold. 
One scope caught my eye as I'd seen Mossberg scopes long ago, but not with this style mounts on it! The mounts are both marked "Mossberg No. 7" and have twin alignment wires built into the mounts to let the scope slide under recoil, and use typical target scope bases. The scope is very nice, with clear lenses, and nice crosshairs. Marked "Mossberg M4 4 Power" Not my usual target scope, but way to clean to pass up at $60. 
Hoping Frank sees this and has some input on this Mossberg scope? Only info I can find calls this combination the No.7M4 as a No. M4 scope in No. 7 mounts.

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A few decades ago I fitted a Mossberg 44US barrel to a Stevens favorite and mounted one these Mossberg scopes. It shot very well and being quite proud of one of first custom builds, I put it out on a gun show table with what I thought was a ridiculous price. Some gun bought it full price and stopped by at the next several gun shows to comment on how well it shot and I regretted selling it ever since. 

Thanks Frank! This one has the short objective bell that measures .950" diameter. The reticle end measures slightly larger than the body at .821" diameter. The adjustment knobs for windage and elevation are odd. The side windage knob just has marks on it, but no numbers. The elevation knob is taller and has fine marks, then 50-75-100 spaced between the smaller marks. The windage moves freely either direction with clicks, but elevation requires pulling down on the tiny pointer to release the knob and let it click either direction? It's also 3/8" taller than the windage knob. Length is 16" OAL.