1970-1990 AD., Germany, Federal Republic, Mainau island Tourist Token.

Germany, Federal Republic, Mainau island Tourist Token, ca. 1970-1990 AD.,
Token (ø 30 mm / 7,56 g), brass plated steel, axis medal alignment ↑↑ (0°), plain edge,
Obv.: INSEL MAINAU / WERTMARKE / · SUBTROPISCHE PFLANZENWELT IM BODENSEE · , aerial view of the Mainau island with buildings and palm trees, boats around, mountains in background, all within circle.
Rev.: DR.h.c. GRAF LENNART BERNADOTTE / · 50 JAHRE SCHAFFEN U. GESTALTEN · , Ginkgo leaf (Ginkgo biloba) within circle.
https://en.numista.com/catalogue/pieces80169.html .

Ginkgo biloba, commonly known as ginkgo or gingko, also known as the maidenhair tree, is the only living species in the division Ginkgophyta, all others being extinct. It is found in fossils dating back 270 million years. Native to China, the tree is widely cultivated, and was cultivated early in human history. It has various uses in traditional medicine and as a source of food. The leaves are unique among seed plants, being fan-shaped with veins radiating out into the leaf blade, sometimes bifurcating (splitting), but never anastomosing to form a network. Two veins enter the leaf blade at the base and fork repeatedly in two; this is known as dichotomous venation. The leaves are usually 5–10 cm (2.0–3.9 in), but sometimes up to 15 cm (5.9 in) long.

Mainau also referred to as Mav(e)no(w), Maienowe (in 1242), Maienow (in 1357), Maienau, Mainowe (in 1394) und Mainaw (in 1580) is an island in Lake Constance (on the Southern shore of the Überlinger See near the city of Konstanz, Baden-Württemberg, Germany). It is maintained as a garden island and a model of excellent environmental practices. Administratively, the island has been a part of Konstanz since December 1, 1971, when the municipality of Litzelstetten, of which Mainau was part, was incorporated into Konstanz. Mainau is still part of Litzelstetten, now one of 15 wards (administrative subdivisions) of Konstanz.
The island belongs to the Lennart Bernadotte-Stiftung (eng. The Lennart Bernadotte Foundation), an entity created by Prince Lennart Bernadotte, Count of Wisborg, originally a Prince of Sweden and Duke of Småland. It is one of the main tourist attractions of Lake Constance. Beside flowers there is a park landscape with views on the lake. There is a greenhouse as well with tropical climate and thousands of butterflies.
Mainau Island is a "flowering island" notable for its parks and gardens. Frederick I, Grand Duke of Baden, created the island's arboretum, which now contains 500 species of deciduous and coniferous trees, many exotic and valuable, including fine specimens of Sequoiadendron giganteum (1864) and Metasequoia glyptostroboides (1952). The island also contains about 200 rhododendron and azalea varieties.
Due to the advantageous climate at the lake, palm trees and other Mediterranean plants can grow on the drop-shaped island. Because of its rich subtropical and partly even tropical vegetation, Mainau Island is also called "flowering island in the Lake Constance". Count Lennart Bernadotte, who passed away in 2004, liked to call his island "Blumenschiff" (engl. flower ship).

More on https://en.wikipedia.org/wiki/Ginkgo_biloba , https://en.wikipedia.org/wiki/Mainau