I don't really see what offer price has to do with anything. The most valuable weight in the charlton catalogue is, I think, a shipwreck weight by Peter Holmes. Books at £1200, but OIP is a paltry £30. But a set of four seasons OIP was £250, with me selling one about 2 weeks ago for £897. I paid £750 odd for my Shipwreck about 18 months ago, so OIP may well of been small, but has pretty much no effect on the price now, or when the charlton catalogue was put together.....
Rather depends which early caithness weights you have for sale.......