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I don't think it is a Cooke or Dollond. My guess would be that it is a Watson and Sons, Troughton&Simms, or Broadhurst-Clarkson. Both W&S and B-C have made scopes that did not have their name engraved.....
I think it may be as old as c1900....
I have a Berry&Mackay 3.25" which has a very similar objective cell but not the external collimation. Though marked as Berry&Mackay(Aberdeen) I believe mine was made by Watson and Sons for the B&M who made other instruments and were a telescope reseller....
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