Lot 1001 is a collection of 28 pages of original plans for the Launceston General Post and Telegraph Office, which form part of a larger collection of plans to be sold at subsequent auctions.

The plans are very detailed and include floor, elevation, detail, and carving and moulding. The lot is of great significance to Tasmanian history, with interest anticipated to come from many different collectors.

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Tullochs co-director Jessica Reid said the plans came to them from a deceased estate and were stored in architectural plan drawers since their creation.

"It's quite interesting on a lot of different fronts, historically interesting and aesthetically because they are beautiful plans," she said.

"It's really interesting because a lot of the plans are in colour as well.

"It's probably going to be a well fought over piece," she said.

The Launceston Post Office was designed by Tasmanian government architect William Waters Eldridge, with the drawings for both the Launceston Post Office and the Telegraph Office dating back to July 8, 1885.

The building was not well received originally because of the bold exterior and interior arrangement. The community called for its demolition, with some going as far as to assert it was "the last and grossest insult to the people of Launceston". Today the post office is iconic to the city and stands proud with its distinctive appearance.

The lot is in an online and timed auction ending September 16.