The celebrated Explorer reference 1016 was introduced into the market in 1959, the first series featuring the non-hacking calibre 1560. One of Rolex's most popular sports watches, the Explorer is easily recognizable by its black dial with the luminous triangle at 12, luminous Arabic numerals for the other three quarters and luminous baton numerals for the remaining hours.
The present watch however is particularly unusual and rare as it is fitted with a highly attractive off-white dial and matching ivory-coloured luminous material to numerals and hands. This unusual dial was almost certainly made by special order.
A similar watch is described and illustrated in 100 Superlative Rolex Watches by John Goldberger, pp. 226 & 227.