Additional Info :
This Lovely IWC is sold as is unrestored and in working order.
"At the end of 1950s IWC introduced an enhanced version of its automatic calibre, the c.853/8531. The changes between the c.852x and the c.853x were minor and affected only a few parts. Apparently, IWC sometimes upgraded the older c. 852x movement with these improvements when they were serviced.
The c.853x movement was introduced in 1958, while the production of c.852 calibre ended one year later. For the Ingenieur line it seems that 1959 was the year of transition as several archive extracts from Schaffhausen show that both calibres were sold to dealers during this period.
The dial styles of the cal. 853x Ingenieurs are generally consistent with those on the earlier cal. 852x models, and there was no effort to "refresh" the look when the movement changed. Dial selection, however, expanded at some point to include more variations than existed before.
Of the early Ingenieurs, the c. 853x versions are the most prevalent on the vintage market. This fact, of course, makes them no less desirable."