Coastar 5x7 Safelight Bulb

A darkroom package I picked up, featuring a free Omega C760 XL dichroic enlarger plus lots of other stuff, included a Coastar 5x7 safelight in excellent condition. No model no. on the safelight but the box said "Code SAF57". The bulb inside was not in good condition and has no markings to indicate what it is but it looks like a small appliance bulb. Anyone know what bulb should be used? The filter is red.

Is it one like this: http://www.ebay.com/itm/Vintage-COA...cca53ea&pid=100011&rk=3&rkt=5&sd=322289538750
If you have a lighting store near you that sells bulbs, the staff may recognize the base and receptacle.

Yes, that's the safelight.

I think I found the answer. B&H sells two other brands of the same size safelight and they both use a 15 watt bulb that looks like the same base and size in my safelight:
https://www.bhphotovideo.com/c/product/122015-REG/General_Brand_15A15CL130_Lamp_15_watts.html

Any 10 or 15 watt tungsten bulb that has the correct base should be fine.
No matter what, however, a safelight test is a good idea.