The links to the image of Avner Mappa's grave in Israel:
https://s3-eu-west-1.amazonaws.com/coridotombimages/Medium/65/6585039E-FEC8-419B-9F69-FE1A77683F87.jpg

Translation:
On the brown part:
Avner Mappa
Clean of hand and pure of heart [a biblical phrase]
Born 15 Tishrei 5778 [this is incorrect. it should be 5678 -- 1917; it would be 1 October]
Died 21 Tishrei 577 [21 October 1984]

On the horizontal, light part:
In memory of family members who perished in the Holocaust:
His father Asher Zelig of blessed memory
His mother Tsvetl Scheindel of blessed memory
Brother Yaakov Yossef of blessed memory
Brother Aharon David of blessed memory
Sister Esther Malka of blessed memory
Brother Moshe of blessed memory
From Lodz Poland.

It is not unusual for people to add names of family members who perished in the Holocaust and whose place of burial is unknow to a gravestone.

--
Odeda Zlotnick
Jerusalem, Israel.