I've got an S4s as well.
I've always been surprised that no one ever started an online registry to track them. There are definitely more than 9 in Lotus Ltd. I've never returned the form listing the cars I own, etc., so mine is not listed in their directory. I doubt I'm the only one.
According to Andy Graham, there were 145 imported to the US. He told me in October 2016 that the US serial numbers run to 159, but some of those cars were reworked to ex-US specs. He does not know why. My car was completed 9/18/95 and is #131, but serial number 134, so most of those repurposed cars came late in 1995. Perhaps they realized that some in process cars would not land in the US before January 1, 1996 and had to make other plans because they weren't OBD2 compliant? I'm curious to know what happened to them (i.e., are there 14 RoW S4s's with US 3xxx serial numbers? Or were they sold in US spec to other nations? Or did they just scratch those serial numbers and assign new ones?). I would presume that Andy could look this up, but I didn't want to bug him.
95 Esprit S4s
87 944 Turbo