
Another cache in a National Numbered Series of Letterbox Hybrid caches, placed to mark one of a diminishing number of post boxes placed in Queen Victoria’s reign and still in use for regular collections by Royal Mail.
The self-inking rubber stamp in the cache is NOT a trade item, and must remain in the cache!
The postbox is on the corner of Station Road and Turnbarrel in Melbourne. There is a property adjacent so please be considerate when gathering the required information. Due to proximity issues and lack of suitable hiding places, the cache is a little distance away. In order to locate it, look at the information on the post box. You will find the final cache at
N52 49.ABC W001 25.DEF
where
A = the second digit in the sorting office address
B = the first digit in the sorting office address
C = the number of letters in the name of the city where the post box was manufactured
D = the first digit in the second half of the postbox number (i.e. after DE73)
E = the number of letters in the surname of the manufacturer of the postbox
F = B - D
The checker below will give you a generous hint as final co-ords were a bit jumpy at time of placing.

You can validate your puzzle solution with certitude.
If you know of an eligible post box and would like to add to this series, please apply to Team Hippo for a series number, giving the following:
- Location as in place name (and street if applicable)
- Location in Lat Long format (DD MM.MMM)
- Postbox number
Please note that featured post boxes should comply with the guidelines above. Caches should be Letterbox Hybrid type (and therefore contain a LB stamp), whether placed at the published co-ords, or a simple offset multi, or multi-stage multi, or more of a puzzle style format.