MRS.-1.5-B-02
NEW BIMBA MRS-1.5-B-02 MAGNETIC REED SWITCH
You will find that Allen Bradley parts often cross-reference with other brands easily.
Bimba MRS.-1.5-B-02 Magnetic Reed Switch (CL186)
A nice detail is how the zinc coated layer protects against galvanic corrosion in mixed metal setups.