After quite some time searching, I was finally able to acquire this:
It will be heading to the watchmaker tomorrow for a full service with new crystal and new NOS original crowns (those took me almost 2 years to find!). It will either go onto a black stingray band or a python band, not sure which one yet (and will probably get both to try).
The Sherpa Guide is a GMT watch using the Enicar 166 movement, which is an in-house development. The power reserve on this one is down to around 22 hours or so, which is only half of the original, indicating a dire need for a new mainspring.
At some point the lower crown was replaced with a generic crown that is much too small. As I mentioned, I was able to source 2 NOS crowns for the watch and these will be installed, along with a new crystal, on the watch.
The outer bezel shows cities worldwide; the red index can be moved through 360° to keep track of one particular city. The inner bezel, which is moved with the upper crown, is a second time zone, in this case set for +6 hours to local time (which here was EST), reflecting the time in Europe (GMT+1). Hence while this picture was taken just before 4 PM, the black-and-red checkered hand shows just before 22, i.e. 10 PM.
I've got an Enicar OPS in wretched state which has been a continuing source of frustration to me (keeps great time, but the inner bezel does not operate and the case has been through a great deal of abuse), largely because fixing the inner bezel is a serious task that continues to elude me (I haven't been able to remove the watch from the case, reflecting probable damage to the inner bezel that has glued this to dial).
This one is, I think, a fine specimen of a classic 1970s design watch that has well stood the test of time. Once maintained and on a proper strap, it will be one of my main daily watches.
PS: Picture taken with the Olympus EP-1, 14-42mm lens, 42mm, 1/15th sec@f 5.6, ISO 800, handheld...