I bought a boxed with docs, no prefix, low 4 digit excellent condition, unconverted example here earlier this year for $1400. I feel very good about the purchase. Haven't seen one nicer or cheaper since.
Bought mine (same as above) 10 years ago for $500, felt good about it then and even better about it now. I tend to agree with hitman that the RENE price guide is on target
I paid $700 at a local gunshow at the end of 23. Unconverted no turn line, but had been shot. No box, I can't remember if 1968 or 69. I'll have to go look again on that.
I bought a converted Old Model in .30 Carbine at a LGS for $1000 out the door last June. I came with the original box and the parts removed for the conversion. Otherwise it was like new. I feel well satisfied with my purchase.