Diana 75?

I am sure the are some LH versions. Any rifle that was used in the Olympics/serious competitive shooting would have to be made in both LH and RH. It's not like Remington making a deer rifle only in RH and telling the LH people to suck it and shoot the RH rifle LH. Target rifles are dedicated to either RH or LH. A left hand person just can't make a right hand target rifle work like they could a RH Remington 700 with a straight stock. Therefore high end target guns were/are offered in both RH and LH. Of course since there fewer LH people out there they made fewer. Also when LH people like me run across the rare LH rifle we hold on to them as we know it will be hard to replace.
 
Wonder if one might look like this 50m rifle?

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John


 
The model 75 is one of the few classic match rifles that was made in a TRUE lefty version - not just the stock but the whole action, with the cocking lever on the left side. They are rather rare of course.

The photo above is a left-handed model 75 Universal (the true Running Boar model 75 looks very similar but has a longer scope rail, a single-stage trigger, and some other minor differences).

The old Anschutz 220 was also made in a true southpaw version. Other classic 10-meter sidelever guns (FWB 300, Anschutz 250) came with lefty stocks, but kept the lever on the right. The old barrel-cocking target guns (HW 55, Walther 55 and LGV, etc.) were also offered with lefty stocks to go with their inherently ambidextrous actions.
 


There are some bargains to be had if you look around. My 75 was bought a few years ago from the coach of a high school rifle team. They were switching to pcps and sold off the 75s to finance the changeover. There were had about a dozen available. All were rebuilt by their resident gunsmith and sold for $300. Mine wears a L/H stock. Removed the sights and covered the gap on the barrel with a sleeve. It is now topped off with an SS-2 scope and is used for fun target work and light pesting. It likes the 9+ gr. RWS Supermags which carry a long way and the flathead meplat seem to smack starlings much harder than domes at its match velocity. 50 yard groups around 1" are possible on a calm day.

Keep looking. You will ultimately snag one and be glad you did.