It's always a shot in the dark but 150 razors is well worth a punt. Unseen I would have offered about $700 and dickered from there but as you say most of them are gash that figure should maybe be lower. Last year I bought the entire contents os a barbershop that had been closed since 1959 - for $800. I'm still selling some of it! (Anybody want a barber pole?). It's all down to dealing - anything is only worth what somoene is willing to pay for it I guess.