The ljutic X73 is the older and cheaper version of the mono. Both guns were produced in the 60's and 70's. The X73 were available as a cost efficient alternative to the mono. In the 70's the 73 was discontinued and Ljutic began playing around with new models like the LTX. BYG
How about a combination of both? I have a basic Mono Gun, Factory refurbished several years ago, with two barrels - one modified choke and one full choke with Sites pattern cut in muzzle - 34" - (I don't know the math). Pull trigger.
The stock is from an X-73 that might be the stock that was on the gun Nadine used to win the Lady's Clay Target at the Grand in '73. I bought the stock from the factory after that Grand and Al was parting out his inventory.
I added a $650 Clyde Slide to damp recoil.
I don't have photos but would sell the gun for $2,000 plus shipping. Or, I would sell the gun pictured for $10,000.