Spanish hand grenades ID

[SAFTA]

Hello, does any one know the name of this spanish hand grenades.
They are made at Santa Barbara Factory, probably 1980- 1990, they must be prototypes, never used in spanish army.
They are very similar. The blue one also exist in Green color.
They are training versions the internal body is made of solid aluminium with a hole in the base

thanks

 

[pajarito]

It seems a prototype before the HGM-10, R-1, MB-8 or M-475 spanish hand grenades. What do you think?

 

[SAFTA]

I think they are prototypes before the SB474 and SB475, made by Santa Barbara, but no oficial name found.
Thanks for your pictures.

 

[Francesco_Dif]

Expal mbs-9a ?

 

[SAFTA]

Sorry Francesco, I have not read your post before.
No, they are not the expal mbs-9a