What is this jammer?

[Yeoman_24]

Can anyone help me identify a model number for the side mount jammer in the photo. I have tried internet searches to no avail. I have a pair to sell in excellent condition but can’t find exactly what they are to help price and advertise them. Thanks.

 

[LadyInBed]

Jamming cheek block.

 

[coopec]

Spinlock BRS Jammer Block

Can you see a similar one here?

spinlock jamming cheek block - Google Search

 

[MoodySabre]

There’s a photo of one here Jib roller furling line block

 

[MoodySabre]

Oops repeat

 

[Yeoman_24]

Thanks for your help everyone