WW1 practice bombs ?

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A friend found these today. They have a wooden plug with a hollow rod that is threaded on the end. I have not found one's  like this. Is this original to these. Thanks.

[opus5150]

WW2 era.  Wooden rod didn't come issued with these, probably someone's attempt to mount it to something or make it into a lamp. 

 

The AN MK-23 practice bomb was one of three similar miniature practice bombs used for low-altitude horizontal or dive bombing practice during WWII. The other two were the AN MK-5 and the AN MK-43. The MK-23 has an overall length of 8.25" and is made of cast iron. The diameter at its largest point is 2.18". The fins are 2.5" in length. The weight, when empty, but with firing pin was 2 lbs-14 oz. while when armed was approximately 3 lbs-0 oz.

The main differences among the three miniature bombs were that the MK-23 was made of cast iron, the MK-5 was made of zinc-alloy, and the MK-43 was made of lead-antimony. This gave each bomb a different weight for a different purpose. All three bombs used a 10-gauge shotgun shell as the signal (AN MK-4) as explained below. The MK-23 was the most common of the miniature practice bombs and was mostly used for land targets, but could not be used against armored-deck target boats. Five bombs could be carried in the MK-43 Bomb Rack and eight could be carried in the MK-47 Bomb Rack which is explained below.

 

Check out this link for what you have.

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Thank you.