If it has the Xenar lens, it's probably (but not necessarily) a top rangefinder model. If so, it should have a Graflok back with Fresnel, unless it was swapped out (which I've seen). Check the shutter speeds on the Xenar - it's in a Syncro-Compur shutter and it's hard to find parts for those so they're not always repairable. Check the bellows carefully for cracks/holes. As was said, make sue the rear rails are fully intact - along with bellows, those are the most common problem with a Crown. If the RF is the top model, make sure it works, and that it has the right cam (those are nearly impossible to find and therefore go for ridiculous money for a tiny bit of stamped sheetmetal). Figure 15 sheet film holders are worth $5 apiece, as long as they're in decent shape. A roll film holder is worth $40+ depending on whether it's an older one (without the pin rollers) or an RH model, especially in 6x9 or even 6x7 (why would anyone want to shoot 6x6 on such a big camera?).
My 2 cents - if the camera is in good condition and the shutter is good and glass clean, it's worth $325, particularly if it has the top RF (the lensboard may or may not be marked "special", by the way)
Dan