This is a superb example of the Wrenn W.2293 "Caledonian" Scot in LMS Black, running number 6141. Introduced by Wrenn, Basildon in late Period 4, very few were produced (less than 50), this I believe being one of the last as it has a 1990 date stamp. No production was recorded in 1991/92 before Basildon closure. The Period 4 box is correctly stamped on both end flaps, as the few  I have seen over the years as a collector are labelled one end, the other being plain.This is one of the most sought after Scots that Wrenn produced.The bottom of the inner box was stamped 90314, indicating 1990 build, the " Packer No" had faded. 

 NOTE: this particular example was for sale on the website, but was purchased within 24 hours of listing.