This is a large naval TEL F A (Mark V) R & J Beck London brass telescope with adjustable magnifications from 15x up to 25x. The telescope has three drawers and it is very powerful and it’s image is very clear. This telescope is extremely rare and it was produced in 1918 during WW1.
Main telescope length when closed: 50cm, or 19.7 inches. (Add about 18cm or 7 inches when the brass eyepiece draw is extended at focus).
Telescope length when extended (excluding the sunshade): 95cm, or 37.4 inches. (Add about 6cm when the sunshade is pulled out)
Objective lens dimeter: 60mm
Main telescope tube diameter: 66mm (2.6 inch)
Brass telescope tubes with three drawers. (Note: two drawers at the front are for quick focus and the third drawer near the eyepiece is used for fine focus adjustment)
Magnification levels are marked on the middle drawer as 15, 17.5, 20, 22.5 and 25. (Note: magnifications can be adjusted by turning this middle drawer itself (with marker names etc. engraved on the tube, see below), while holding the brass ring next to it).
Engraved on the rotatable tube section:
(A Broad Arrow mark, indicating Ministry of Defence ownership)
TEL F.A. (MARK V)
R & J BECK LTD.
Weight: approx. 2.5 kg (5.5 lb.)
Sliding brass eyepiece cover.
This telescope is in good working condition for its age with very clear images.
There are some small dents on the main telescope body surface although these do not affect the use of the scope in any way. No dents are found on the internal draw sections of the scope and all drawers glide smoothly.
There is a crack in the middle of the front lens but this is not visible at all when looking through the telescope in normal way and it does not seem to affect the performance of the telescope in any way.
All internal lenses have been cleaned and no damage, dirt or fungus on these lenses. The telescope gives very clear image.
This antique naval telescope is good for long distance observations with high power. For its length, this telescope is better used with a stand or some kind of support. There are six screw mounting points on the main scope body (as shown in the photos), suggesting that these were probably used for fixing a tripod mounting plate.
This telescope is extremely rare and so far the second one with the same style has not been found in the market.
Please see photos for further details.