The best Romanian AK to get, in 7.62x39....... They were called the WUM-1 as well; Be sure to check it first, as some (mostly the WUMs) have a receiver with an FPK/PSL style back, to prevent a standard stock from being installed.
But they will be a nice, factory Romy gun. It will also be a true AKM style, vs an AK74 in 7.62, or a civy sporter.
Here is mine-
Most scope rails on the dust cover are considered junk. If the internals are fine and the barrel looks good, I can say a $600-700 price tag is fair to me. You can get a new WASR 10/63 for $550 (before FLL fees & shipping) if that helps get a perspective.
The top cover with scope rail is probably aftermarket, which adds nothing to the value IMO. If you wanted to restore it to more correct condition you'd have to buy or trade for a standard topcover. Looking closely it seems that the muzzle is not threaded. I'm not sure if some of these rifles were and some were not. Many buyers would consider an unthreaded muzzle as a downgrade to the value, but YMMV. If it's unthreaded, and you want to be able to attach a muzzle device, you can either buy a clamp-on or pay $100 or so to have it threaded.
None of the Romaks came over with threaded muzzles as they were imported during the clinton stupidity, and evil features were a no-no. Most had a muzzle nut tack welded over the barrel, but there were still no threads under it.
In fact they came over with Romak 3 style stocks so that they didn't have that evil separate pistol grip. This allowed them to be imported with the full Romanian trigger group, as opposed to the SAR series that had Century trigger groups, and early WASRs that were convertered also had Century fire control parts. Depending on how the one in the picture was converted to evil pistol grip, it might still have the original Romanian fire control parts.
With WASRs selling for what they are these days, the Romak 1, even with the wrong stock set and wrong top cover would still be worth $600 +/- a few dollars.
As for quality, they were among the nicer of the Romanians.