1000 GUINEAS 1829
The 16th winner of the 1000 Guineas, held on Thursday 7th May 1829 over the Ditch Mile, was Young Mouse (9/4 fav), a bay filly by Godolphin out of Mouse, owned by Lord George Cavendish. A field of 4 runners contested the race which was worth 1900 Guineas (Equivalent to £199,500 in 2017)
Horse Jockey Trainer Owner/Betting
YOUNG MOUSE Bill Arnull R Dixon Boyce Lord George Cavendish 20/1
GREEN MANTLE     Lord Exeter 6/4
PAULINE     Mr Payne 4/5
ACACIA     Lord Exeter 20/1
Note that only the Sporting Magazine reported the winner's odds of 20/1 Over Round 105%

The newspaper extract below is shown courtesy of the British Library Online.