Hi declang
Here is a photo of the 1862 penny with signature:
http://www.the-saleroom.com/en-gb/auction-catalogues/london-coins/catalogue-id-srlo10011/lot-72b6f282-62a1-48c1-9f11-a55300c5e384
A few years since your post, but maybe you still would like an answer.
Obverse 2 is different from the normal obverse 6, found on almost all 1862 pennies, not only in having the signature below the bottom right of the bust, but also by having the lowest leaf of the top group point to the upper dot of the colon after 'D:G:' On obverse 6 it points clearly above it, as the bust is higher.
The signature on obverse 2 only shows on coins with little or no wear, as the bottom half of these tiny letters was not struck up.
By the way, obverse 3 also occurs for 1862. Also ex. rare. Very similar to obv. 2, but no diagnostic hollow on the bottom centre of the bust.