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Ditto to Matts comments
Pentax XWs are an excellent option especially in terms of ER.
Televue Naglers such as T6 range are very good in providing larger field of view but at the expense of eye-relief
Vixen LVWs are also an extremely good option and are roughly the same design as the Pentax (with the inclusion of a 17mm focal length EP)
The bad news is all of them are quite hard to get your hands on in the 2nd hand market as they are all excellent and thus all sought after.
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