Are these the censuses you have for him?
1911c
Robert Bell age 51 born Durham occupation miner
Frances, William Hooks, James Hooks, Margaret Bell 16, Armstrong Bell 18, Elizabeth Bell 13, Nora Hooks, Robert Bell 3, Edwin Bell 3 mths
1901c
Robert Bell age 37 born (county ditto North’d) Seaton Delavel occ coal hewer
Mary 30, Thos 10, Margt. 8, Armstrong 6, Mary Eliz 3 & Alice L 2 mths
1891c
Robert Bell age 28 born Durham She?ing Moor occ coal miner
Mary 20, Robert 1 & Thomas C 5 mths
Seaton Delaval Northumberland is in the registration district of Tynemouth - there are quite a few Robert Bell’s born between 1861 - 1866 Tynemouth as you say difficult to narrow it down
If you have his father’s name you could at least cross reference each of those individual mother’s maiden looking for a marriage entry on FreeBMD for a ? Bell to ?