Hi there, NASH'S FLAT ...
Back to the Parish Maps .... on the Second Sheet (14761201, c1896), there's lots of details about parish numbers, purchasers etc. and notes to draftsmen and others using those plans when they were working drawings in the Surveyor Gen's Sydney office. I expect this particular drawing/plan/map would have been based on earlier drawings, perhaps back into the 1860's.....
Purchasers names include M Nash, (yes, there's full administrative particulars/details (1518, 158, 203 1527)for his lot 3 acres, 138A and his 4 acres 139A. He also purchased a tad over 2 acres as noted on that drawing (10W 28.1527R). There's also purchasers: H W Oliver, Catherine Scifleet etc.
Also, on google map .... Marshfield Road, Glen Ayr (near Mudgee) would be nearer the Waterworks and Sawpit etc.
Also, online newspapers, the NLA are commencing to digitise on their main site, the Maitland Mercury .... not yet finalised the 1860's but pre-alert for another sighting of "Nash's Flat" ...
The Maitland Mercury... Thursday 10 April 1862, page 3. News 3091 words
... bite of a Snake.-LoBt week, as the daughter of Mr. 0. Clifton, Nash's Flat, was sitting at needle ... a.m. It could be a mishmash of several articles, so I have not followed up for CLIFTON .... but it does seem to show that people were settled at Nash's Flat ...
Cheers, JM (with help from M i L, yet again in amazement of the Internet ! ... and the amount of detail on those parish maps !)