I recently received an IWC watch - it seems to be from the 1950's and came with a box (I think it's original) bearing a label: Max Birnbaum Uhrmacher, Luzern. The watch repairman told me it was gold and mentioned a value that seemed considerable to me. The watch did not require repair and keeps good time, although I don't think it had been worn for decades. How should I care for this watch? Is it extremely careless of me to wear it every day? (I work in education - not as a mechanic or diver). I remove it at home for washing dishes, cooking or cleaning. Is it risky to wear it to work? Thanks for the advice!