These planes, used to start a moulding, were produced and sold in matching pairs so as to overcome grain direction.
The 1861 MARPLES Catalogue lists them as ‘Snipes Bill‘{singular}:
The 1873 Catalogue now gives them item numbers and changes the name to ‘Snipe Bills‘{pair} :
The 1897 listing, showing new Item numbers:
1909 shows another number change:
They are omitted from the 1921 Catalogue but re-appear in 1928 [below], but that was the last catalogue reference that I can find for Snipe Bills.