It's your money and it may look to you mint, but a sharp eye will tell you it isn't in pristine condition.
I saw an I4, NOS Super Speed last week for about half on the card.I personally wouldn't. It's not my birth year and I don't like Techs.
Do you like Techs? If you do, and want a birth year example, I would go for it. Keep in mind it is only worth the premium $80 to you. If you decide to sell or trade, you may only get half the price you paid. Even that may be pushing it. That Tech style is widely available and tends to be on the lower end of Gillette prices.
I prefer Superspeeds. I am a later B1 (1981). I have NEVER seen one for sale. With that in mind, I don't want to think what I would pay for one.
Very good advice right there. The worst the seller can say is no.I have dealt with that seller before and he is a reasonable person. I would contact him and make an offer. Tell him that the razor looks great but the price is a little high and if he would accept $XX for it. As long as you don't offer him some low ball price, but something close to what he is offering, I think it should go well.
This is exactly my opinion and experience also!It is very much on the high side but that is not important. As a one off, if you like it and want it, and it will bring you lasting happiness then buy it; that is what money is for. If however you are simply buying the first of many razors, then no as it is overpriced by a long long way.